This is called from rsc_parse() with a use controlled value. Say for example that "gidsetsize" is negative, then we could end up allocating less than sizeof(struct group_info) leading to memory corruption. Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> --- I copied the NGROUPS_MAX limit from the surrounding code, I'm not absolutely that it's the correct limit to use. diff --git a/kernel/groups.c b/kernel/groups.c index 664411f..e9341b3 100644 --- a/kernel/groups.c +++ b/kernel/groups.c @@ -18,6 +18,9 @@ struct group_info *groups_alloc(int gidsetsize) int nblocks; int i; + if ((unsigned)gidsetsize > NGROUPS_MAX) + return NULL; + nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK; /* Make sure we always allocate at least one indirect block pointer */ nblocks = nblocks ? : 1; -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
