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authorPaul Eggert <eggert@cs.ucla.edu>2010-01-22 10:52:38 -0800
committerUlrich Drepper <drepper@redhat.com>2010-01-22 10:52:38 -0800
commitdaa8454919de6c4e8b914c5d45276abd20baab08 (patch)
tree6cfa85d7ad5f6eaacc531ff168bb9045830a1d59 /posix
parentd044d844dd011bb26317ac36da2d22ebe19621b1 (diff)
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regexec.c: avoid arithmetic overflow in buffer size calculation
Diffstat (limited to 'posix')
-rw-r--r--posix/regexec.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/posix/regexec.c b/posix/regexec.c
index c7d0b37ef5..3765d00ffd 100644
--- a/posix/regexec.c
+++ b/posix/regexec.c
@@ -3359,6 +3359,13 @@ build_trtable (const re_dfa_t *dfa, re_dfastate_t *state)
   if (BE (err != REG_NOERROR, 0))
     goto out_free;
 
+  /* Avoid arithmetic overflow in size calculation.  */
+  if (BE ((((SIZE_MAX - (sizeof (re_node_set) + sizeof (bitset_t)) * SBC_MAX)
+	    / (3 * sizeof (re_dfastate_t *)))
+	   < ndests),
+	  0))
+    goto out_free;
+
   if (__libc_use_alloca ((sizeof (re_node_set) + sizeof (bitset_t)) * SBC_MAX
 			 + ndests * 3 * sizeof (re_dfastate_t *)))
     dest_states = (re_dfastate_t **)