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Add regex to delta code so we don't segfault when reading line

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If the delta line doesn't match our regex, we won't go and process it,
possibly walking off the end of the string.

Signed-off-by: Dan McGee <dan@archlinux.org>
This commit is contained in:
Dan McGee 2008-11-30 17:17:00 -06:00
parent a50b067470
commit b99bebc008
2 changed files with 19 additions and 1 deletions
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5
lib/libalpm/be_files.c
View File

@ -618,7 +618,10 @@ int _alpm_db_read(pmdb_t *db, pmpkg_t *info, pmdbinfrq_t inforeq)
_alpm_strtrim(line); _alpm_strtrim(line);
if(strcmp(line, "%DELTAS%") == 0) { if(strcmp(line, "%DELTAS%") == 0) {
while(fgets(line, 512, fp) && strlen(_alpm_strtrim(line))) { while(fgets(line, 512, fp) && strlen(_alpm_strtrim(line))) {
info->deltas = alpm_list_add(info->deltas, _alpm_delta_parse(line)); pmdelta_t *delta = _alpm_delta_parse(line);
if(delta) {
info->deltas = alpm_list_add(info->deltas, delta);
}
} }
} }
} }

15
lib/libalpm/delta.c
View File

@ -22,6 +22,8 @@
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <limits.h> #include <limits.h>
#include <sys/types.h>
#include <regex.h>
/* libalpm */ /* libalpm */
#include "delta.h" #include "delta.h"
@ -257,6 +259,19 @@ pmdelta_t *_alpm_delta_parse(char *line)
{ {
pmdelta_t *delta; pmdelta_t *delta;
char *tmp = line, *tmp2; char *tmp = line, *tmp2;
regex_t reg;
regcomp(&reg,
"^[^[:space:]]* [[:xdigit:]]{32}"
" [^[:space:]]* [[:xdigit:]]{32}"
" [^[:space:]]* [[:xdigit:]]{32} [[:digit:]]*$",
REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
if(regexec(&reg, line, 0, 0, 0) != 0) {
/* delta line is invalid, return NULL */
regfree(&reg);
return(NULL);
}
regfree(&reg);
CALLOC(delta, 1, sizeof(pmdelta_t), RET_ERR(PM_ERR_MEMORY, NULL)); CALLOC(delta, 1, sizeof(pmdelta_t), RET_ERR(PM_ERR_MEMORY, NULL));