From 898b5ece63b796443073f505a4403a35906f1b0b Mon Sep 17 00:00:00 2001 From: Nikolaus Schulz Date: Thu, 1 Apr 2010 02:21:10 +0900 Subject: [PATCH] fat: fix buffer overflow in vfat_create_shortname() commit 30d1872d9eb3663b4cf7bdebcbf5cd465674cced upstream. When using the string representation of a random counter as part of the base name, ensure that it is no longer than 4 bytes. Since we are repeatedly decrementing the counter in a loop until we have found a unique base name, the counter may wrap around zero; therefore, it is not enough to mask its higher bits before entering the loop, this must be done inside the loop. [hirofumi@mail.parknet.co.jp: use snprintf()] Signed-off-by: Nikolaus Schulz Signed-off-by: OGAWA Hirofumi Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- fs/fat/namei_vfat.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c index f565f24019b5..72646e2c0f48 100644 --- a/fs/fat/namei_vfat.c +++ b/fs/fat/namei_vfat.c @@ -309,7 +309,7 @@ static int vfat_create_shortname(struct inode *dir, struct nls_table *nls, { struct fat_mount_options *opts = &MSDOS_SB(dir->i_sb)->options; wchar_t *ip, *ext_start, *end, *name_start; - unsigned char base[9], ext[4], buf[8], *p; + unsigned char base[9], ext[4], buf[5], *p; unsigned char charbuf[NLS_MAX_CHARSET_SIZE]; int chl, chi; int sz = 0, extlen, baselen, i, numtail_baselen, numtail2_baselen; @@ -467,7 +467,7 @@ static int vfat_create_shortname(struct inode *dir, struct nls_table *nls, return 0; } - i = jiffies & 0xffff; + i = jiffies; sz = (jiffies >> 16) & 0x7; if (baselen > 2) { baselen = numtail2_baselen; @@ -476,7 +476,7 @@ static int vfat_create_shortname(struct inode *dir, struct nls_table *nls, name_res[baselen + 4] = '~'; name_res[baselen + 5] = '1' + sz; while (1) { - sprintf(buf, "%04X", i); + snprintf(buf, sizeof(buf), "%04X", i & 0xffff); memcpy(&name_res[baselen], buf, 4); if (vfat_find_form(dir, name_res) < 0) break; -- 2.39.5