parser yang BUGFIX parsing revisions longer than LY_REV_SIZE

jvijtiuk · michalvasko · commit 74dad9e46398 · 2021-05-27T07:17:52.000+02:00
Change date_len argument type to size_t in lysp_check_date,
instead of uint8_t.

This bug was found by OSS-Fuzz in lys_parse_mem.

The issue would appear when a revision longer than LY_REV_SIZE was
in the input model. get_argument() would parse the string and return
a length that is significantly bigger than LY_REV_SIZE.
The word_len was then cast into a uint8_t, and since word_len is a
size_t an overflow would occur, where only the first 10 characters of
the string would be read, resulting in the date appearing as valid in
lysp_check_date(). The strncpy() into rev-&gt;date would then result in an
overflow, as word_len bytes are copied.

Signed-off-by: Juraj Vijtiuk &lt;juraj.vijtiuk@sartura.hr&gt;
diff --git a/src/tree_schema_helpers.c b/src/tree_schema_helpers.c
@@ -58,7 +58,7 @@ lysp_check_prefix(struct lys_parser_ctx *ctx, struct lysp_import *imports, const
 }
 
 LY_ERR
-lysp_check_date(struct lys_parser_ctx *ctx, const char *date, uint8_t date_len, const char *stmt)
+lysp_check_date(struct lys_parser_ctx *ctx, const char *date, size_t date_len, const char *stmt)
 {
     struct tm tm, tm_;
     char *r;
diff --git a/src/tree_schema_internal.h b/src/tree_schema_internal.h
@@ -233,7 +233,7 @@ LY_ERR lysp_check_prefix(struct lys_parser_ctx *ctx, struct lysp_import *imports
  * @param[in] stmt Statement name for error message.
  * @return LY_ERR value.
  */
-LY_ERR lysp_check_date(struct lys_parser_ctx *ctx, const char *date, uint8_t date_len, const char *stmt);
+LY_ERR lysp_check_date(struct lys_parser_ctx *ctx, const char *date, size_t date_len, const char *stmt);
 
 /**
  * @brief Check names of typedefs in the parsed module to detect collisions.
diff --git a/tests/fuzz/corpus/lys_parse_mem/pull1592.yang b/tests/fuzz/corpus/lys_parse_mem/pull1592.yang
@@ -0,0 +1,67 @@
+module
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+nn
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+{revision
+"2016-08-05{
+aaimod:uhGGaaaaaaaaa;aaaiiiiiGGiiiircodimoaa;aaai_od;aaiGGiiiin
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+{revisd:umGG{{{{{{{{{{{{{{{{{{{;{{{{{{aaaaaadkaaaaaaaaaiiiiiimiiiiiiiGGiiiiimodimod:umGGaaaaaaaaa;aaaimod:umGUaaaaaaaaa;aaaiiii[GGiiiiimodimod:umGGaaaaaaaaa;amodule
+odpmduLepd{iiiiiiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm:mmmmmmmm{{{{dpmduLed{{{{{{{{{{{{{{{{iiiimod:{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmm5833472564209382772827879od:ul{{k{{{siiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod󠀳:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm:mmmmmmmm{{{{dpmduLed{{{{{{{{{{{{{{{{iiiimod:{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmzmmmmmmmmmmmmmmmmmmmmm{{{{dpmduLed{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{iimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iciiiiiiiihiiiiiiiiiGGiiiiimod:u-------------j----mmmmmmmmm{{{{dpmduLed{{{{{{QQQQQQQQQQQQQQQQQQQmmmmmmmmm󠁫mmmmmmmmmmmmmmmmmmmmmmmmmmmm{{{{dpmduLed{piiiiiiiiiiiihiiiiiiiiiGGiiiii215833472564209382772827879od:ul{{k{{{siiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod󠀳:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm:mmmmmmmm{{{{dpmduLed{{{{{{{{{{{{{{{{iiiimod:{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmm5833472564209382772827879od:ul{{k{{{siiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod󠀳:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm:mmmmmmmm{{{{dpmduLed{{{{{{{{{{{{{{{{iiiimod:{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmzmmmmmmmmmmmmmmmmmmmmm{{{{dpmduLed{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{iimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iciiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm{{{{dpmduLed{{{{{{QQQQQQQQQQQQQQQQQQQmmmmmm{{{{{{{{mmQQQQQQQQQQQQQQQQQQQQQmmmmm󠁯mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm{{{{dpmduLed{piiiiiiiiiiiihiiiiiiiiiGGiiiii0od:ul{{k{{{siiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiamod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmrmmm--------------------------------------------------------mmmmmmmmmmmmmm{{{{dpmduLed{piiiiiiiiiiiihiiiiiiiiiGGiiiii0od:ul{{k{{{siiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmrmmm-----------------------------------iiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmrmmm--------------------------------------------------------mmmmmmmmmmmmmm{{{{dpmduLed{piiiiiiiiiiiihiiiiiiiiiGGiiiii0od:ul{{k{{{siiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmrmmm------------------------------------------------------------------------------------------------------------------------------------------------------------QQQQQQQQQQQQQQQQmmmmmm{{{{{{{{mmQQQQQQQQQQQQQQQQQQQQQmmmmm󠁯mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm{{{{dpmduLed{piiiiiiiiiiiihiiiiiiiiiGGiiiii0od:ul{{k{{{siiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiamod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmrmmm--------------------------------------------------------mmmmmmmmmmmmmm{{{{dpmduLed{piiiiiiiiiiiihiiiiiiiiiGGiiiii0od:ul{{k{{{siiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmrmmm-----------------------------------iiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmrmmm--------------------------------------------------------mmmmmmmmmmmmmm{{{{dpmduLed{piiiiiiiiiiiihiiiiiiiiiGGiiiii0od:ul{{k{{{siiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmrmmm---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------j----mmmmmmmmm{{{{dpmduLed{{{{{{QQQQQ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+//////
+rpsubmodule
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+///
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+1n-esudmmmmmmmmmmmmmmmmmmmmmmmm:mmmmmmmm{{{{dpmduLed{{{{{{{{{{{{{{{{iiiimod:{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmzmmmmmmmmmmmmmmmmmmmmm{{{{dpmduLed{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{iimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm{{{{dpmduLed{{{{{{QQQQQQQQQQQQQQQQQQQmmmmmm{{{{{{{{mmQQQQQQQQQQQQQQQQQQQQQmmmmm󠁯mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm{{{{dpmduLed{piiiiiiiiiiiihiiiiiiiiiGGiiiii0od:ulmduLed{{{{{{{{{{{{{{{{iii{{{{{{{{{{iiiimod:ul{{{{{{iimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm{{{{dpmduLed{{{{{{QQQQQQQQQQQQQQQQQQQmmmmmm{{{{{{{{mmQQQQQQQQQQQQQQQQQQQQGiiiii0od:ul{{k{{{siiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiamod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmrmmm--------------------------------------------------------mmmmmmmmmmmmmm{{{{dpmduLed{piiiiiiiiiiiihiiiiiiiiiGGiiiii0od:ul{{k{{{siiiiGGiiiii:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmrmmm---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------j----mmmmmmmmm{{{{dpmduLed{{{{{{QQQQQQQQQQQQQQQQQQQmmmmm{{dpmduLed{piiiiiiiiiiiihiiiiiiiiiGGiiiii215833472564209382772827879od:ul{{k{{{siiiiGGiiiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiimod:uln{{{{iiiiiiiiihiiiiiiiiiGGiiiiimod󠀳:ul{{{{{{{{{{{{{{{{{{{{iiiimod:ul{{{{{{{{{{{{{{{{{{{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm:mmmmmmmm{{{{dpmduLed{{{{{{{{{{{{{{{{iiiimod:{{iiiim{{mmmmmmmmmmmmmmmmmmmmmmmmmm5833472564209382772827879od:ul{{k{{{siii

Original file line number	Diff line number	Diff line change
`@@ -58,7 +58,7 @@ lysp_check_prefix(struct lys_parser_ctx ctx, struct lysp_import imports, const`
`58`	`58`	`}`
`59`	`59`
`60`	`60`	`LY_ERR`
`61`		`-lysp_check_date(struct lys_parser_ctx ctx, const char date, uint8_t date_len, const char *stmt)`
	`61`	`+lysp_check_date(struct lys_parser_ctx ctx, const char date, size_t date_len, const char *stmt)`
`62`	`62`	`{`
`63`	`63`	`struct tm tm, tm_;`
`64`	`64`	`char *r;`