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grep: cap insane -B NUM values to MAX_INT / 8. Fixes bug 2653.

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function                                             old     new   delta
grep_main                                            766     779     +13

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-10-02 12:42:28 +02:00
parent 2d1a78b88f
commit 0296fd3af1
1 changed files with 9 additions and 6 deletions
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15
findutils/grep.c
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@ -621,30 +621,33 @@ int grep_main(int argc UNUSED_PARAM, char **argv)
/* do normal option parsing */
#if ENABLE_FEATURE_GREP_CONTEXT
int Copt;
int Copt, opts;
/* -H unsets -h; -C unsets -A,-B; -e,-f are lists;
* -m,-A,-B,-C have numeric param */
opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+";
getopt32(argv,
opts = getopt32(argv,
OPTSTR_GREP,
&pattern_head, &fopt, &max_matches,
&lines_after, &lines_before, &Copt);
if (option_mask32 & OPT_C) {
if (opts & OPT_C) {
/* -C unsets prev -A and -B, but following -A or -B
may override it */
if (!(option_mask32 & OPT_A)) /* not overridden */
if (!(opts & OPT_A)) /* not overridden */
lines_after = Copt;
if (!(option_mask32 & OPT_B)) /* not overridden */
if (!(opts & OPT_B)) /* not overridden */
lines_before = Copt;
}
/* sanity checks */
if (option_mask32 & (OPT_c|OPT_q|OPT_l|OPT_L)) {
if (opts & (OPT_c|OPT_q|OPT_l|OPT_L)) {
option_mask32 &= ~OPT_n;
lines_before = 0;
lines_after = 0;
} else if (lines_before > 0) {
if (lines_before > INT_MAX / sizeof(long long))
lines_before = INT_MAX / sizeof(long long);
/* overflow in (lines_before * sizeof(x)) is prevented (above) */
before_buf = xzalloc(lines_before * sizeof(before_buf[0]));
IF_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));)
}