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fat: restore original value when fat_ent_write failed

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fat_ent_write() may have committed the new link to the primary FAT but
then failed on the mirror copy, leaving the chain pointing to new_dclus
even though the caller will free it.  Restore the original value to keep
the chain consistent.

Link: https://lore.kernel.org/20260525085649.781643-1-n05ec@lzu.edu.cn
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Yemu Lu <prcups@krgm.moe>
Signed-off-by: Ren Wei <n05ec@lzu.edu.cn>
Reported-by: Yuan Tan <yuantan098@gmail.com>
Reported-by: Yifan Wu <yifanwucs@gmail.com>
Reported-by: Juefei Pu <tomapufckgml@gmail.com>
Reported-by: Xin Liu <bird@lzu.edu.cn>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Christian Brauner <brauner@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Yemu Lu 2026-05-25 16:56:49 +08:00 committed by Andrew Morton
parent a0275efa65
commit 64d9183203
1 changed files with 4 additions and 0 deletions
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4
fs/fat/misc.c
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@ -133,7 +133,11 @@ int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster)
ret = fat_ent_read(inode, &fatent, last);
if (ret >= 0) {
int wait = inode_needs_sync(inode);
int old = ret;
ret = fat_ent_write(inode, &fatent, new_dclus, wait);
if (ret < 0)
fat_ent_write(inode, &fatent, old, wait);
fatent_brelse(&fatent);
}
if (ret < 0)