From: Xi Wang <[email protected]> Subject: sysctl: fix null checking in bin_dn_node_address()
The null check of `strchr() + 1' is broken, which is always non-null, leading to OOB read. Instead, check the result of strchr(). Signed-off-by: Xi Wang <[email protected]> Cc: "Eric W. Biederman" <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> --- kernel/sysctl_binary.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff -puN kernel/sysctl_binary.c~sysctl-fix-null-checking-in-bin_dn_node_address kernel/sysctl_binary.c --- a/kernel/sysctl_binary.c~sysctl-fix-null-checking-in-bin_dn_node_address +++ a/kernel/sysctl_binary.c @@ -1171,9 +1171,10 @@ static ssize_t bin_dn_node_address(struc /* Convert the decnet address to binary */ result = -EIO; - nodep = strchr(buf, '.') + 1; + nodep = strchr(buf, '.'); if (!nodep) goto out; + ++nodep; area = simple_strtoul(buf, NULL, 10); node = simple_strtoul(nodep, NULL, 10); _ -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
