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| author | Anton Blanchard <anton@samba.org> | 2012-03-16 10:28:07 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-03-23 11:20:51 -0700 |
| commit | 4376d0751532595d76d8dbe9a7ddb6d92f08ff82 (patch) | |
| tree | 674b0ed19043b3dab9dfc52d3a8be2a3036b0284 /fs/afs | |
| parent | f4565db7fa0694572ac50b8615c7ac3dc936e012 (diff) | |
| download | lwn-4376d0751532595d76d8dbe9a7ddb6d92f08ff82.tar.gz lwn-4376d0751532595d76d8dbe9a7ddb6d92f08ff82.zip | |
afs: Read of file returns EBADMSG
commit 2c724fb92732c0b2a5629eb8af74e82eb62ac947 upstream.
A read of a large file on an afs mount failed:
# cat junk.file > /dev/null
cat: junk.file: Bad message
Looking at the trace, call->offset wrapped since it is only an
unsigned short. In afs_extract_data:
_enter("{%u},{%zu},%d,,%zu", call->offset, len, last, count);
...
if (call->offset < count) {
if (last) {
_leave(" = -EBADMSG [%d < %zu]", call->offset, count);
return -EBADMSG;
}
Which matches the trace:
[cat ] ==> afs_extract_data({65132},{524},1,,65536)
[cat ] <== afs_extract_data() = -EBADMSG [0 < 65536]
call->offset went from 65132 to 0. Fix this by making call->offset an
unsigned int.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/afs')
| -rw-r--r-- | fs/afs/internal.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/afs/internal.h b/fs/afs/internal.h index 5a9b6843bac1..1f3624d3b24f 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -109,7 +109,7 @@ struct afs_call { unsigned reply_size; /* current size of reply */ unsigned first_offset; /* offset into mapping[first] */ unsigned last_to; /* amount of mapping[last] */ - unsigned short offset; /* offset into received data store */ + unsigned offset; /* offset into received data store */ unsigned char unmarshall; /* unmarshalling phase */ bool incoming; /* T if incoming call */ bool send_pages; /* T if data from mapping should be sent */ |