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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2021-09-21 23:33:35 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-30 10:09:24 +0200 |
| commit | d140ccb140c2b082bd2fd61a0b444bcb4d2e6b43 (patch) | |
| tree | 821eb62429438371bbace620125458ec6b51e152 /fs/cifs | |
| parent | 1c1062c5cf215c960373c75acb96dc601714ed88 (diff) | |
| download | linux-stable-d140ccb140c2b082bd2fd61a0b444bcb4d2e6b43.tar.gz linux-stable-d140ccb140c2b082bd2fd61a0b444bcb4d2e6b43.tar.bz2 linux-stable-d140ccb140c2b082bd2fd61a0b444bcb4d2e6b43.zip | |
cifs: fix a sign extension bug
[ Upstream commit e946d3c887a9dc33aa82a349c6284f4a084163f4 ]
The problem is the mismatched types between "ctx->total_len" which is
an unsigned int, "rc" which is an int, and "ctx->rc" which is a
ssize_t. The code does:
ctx->rc = (rc == 0) ? ctx->total_len : rc;
We want "ctx->rc" to store the negative "rc" error code. But what
happens is that "rc" is type promoted to a high unsigned int and
'ctx->rc" will store the high positive value instead of a negative
value.
The fix is to change "rc" from an int to a ssize_t.
Fixes: c610c4b619e5 ("CIFS: Add asynchronous write support through kernel AIO")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs/cifs')
| -rw-r--r-- | fs/cifs/file.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 1aac8d38f887..a9746af5a44d 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -2989,7 +2989,7 @@ static void collect_uncached_write_data(struct cifs_aio_ctx *ctx) struct cifs_tcon *tcon; struct cifs_sb_info *cifs_sb; struct dentry *dentry = ctx->cfile->dentry; - int rc; + ssize_t rc; tcon = tlink_tcon(ctx->cfile->tlink); cifs_sb = CIFS_SB(dentry->d_sb); |