From 0296fd3af1cb3f9cceabc31dd39b6a00b66cb65d Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Sat, 2 Oct 2010 12:42:28 +0200 Subject: [PATCH] grep: cap insane -B NUM values to MAX_INT / 8. Fixes bug 2653. function old new delta grep_main 766 779 +13 Signed-off-by: Denys Vlasenko --- findutils/grep.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/findutils/grep.c b/findutils/grep.c index 024f27609..ff6742a69 100644 --- a/findutils/grep.c +++ b/findutils/grep.c @@ -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]));) } -- 2.25.1