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cifs: fix a sign extension bug

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[ Upstream commit e946d3c887 ]

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: c610c4b619 ("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>
This commit is contained in:
Dan Carpenter 2021-09-21 23:33:35 +03:00 committed by Greg Kroah-Hartman
parent 1c1062c5cf
commit d140ccb140
1 changed files with 1 additions and 1 deletions
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2
fs/cifs/file.c
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@ -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);