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fix signedness error handling invalid multibyte sequences in regexec 

the "< 0" test was always false due to use of an unsigned type. this
resulted in infinite loops on 32-bit machines (adding -1U to a pointer
is the same as adding -1) and crashes on 64-bit machines (offsetting
the string pointer by 4gb-1b when an illegal sequence was hit).
This commit is contained in:
Rich Felker 2012-04-14 22:32:42 -04:00
parent 0115a6ed96
commit b9dd43db04
1 changed files with 2 additions and 2 deletions
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4
src/regex/regexec.c
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@ -174,7 +174,7 @@ tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string,
tre_char_t prev_c = 0, next_c = 0; tre_char_t prev_c = 0, next_c = 0;
const char *str_byte = string; const char *str_byte = string;
int pos = -1; int pos = -1;
unsigned int pos_add_next = 1; int pos_add_next = 1;
#ifdef TRE_MBSTATE #ifdef TRE_MBSTATE
mbstate_t mbstate; mbstate_t mbstate;
#endif /* TRE_MBSTATE */ #endif /* TRE_MBSTATE */
@ -583,7 +583,7 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
tre_char_t prev_c = 0, next_c = 0; tre_char_t prev_c = 0, next_c = 0;
const char *str_byte = string; const char *str_byte = string;
int pos = 0; int pos = 0;
unsigned int pos_add_next = 1; int pos_add_next = 1;
#ifdef TRE_MBSTATE #ifdef TRE_MBSTATE
mbstate_t mbstate; mbstate_t mbstate;
#endif /* TRE_MBSTATE */ #endif /* TRE_MBSTATE */