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| author | Rob Landley <rob@landley.net> | 2006-06-25 15:29:12 +0000 |
|---|---|---|
| committer | Rob Landley <rob@landley.net> | 2006-06-25 15:29:12 +0000 |
| commit | 934da82913f70ea3c68bcbcd7b184be54c2c2061 (patch) | |
| tree | 38dc2347244d1ace56adae98b04c9055b6ba1cca | |
| parent | 768945b762b8850691acd2b63116eed18faa1812 (diff) | |
| download | busybox-934da82913f70ea3c68bcbcd7b184be54c2c2061.tar.gz | |
Fix a possible race condition if two processes try to claim the same loop
device at the same time. We should only CLR_FD if the set status fails,
not if the SET_FD fails.
| -rw-r--r-- | libbb/loop.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/libbb/loop.c b/libbb/loop.c index 2f9d02924..e5b21642e 100644 --- a/libbb/loop.c +++ b/libbb/loop.c @@ -118,9 +118,10 @@ int set_loop(char **device, const char *file, int offset) safe_strncpy((char *)loopinfo.lo_file_name, file, LO_NAME_SIZE); loopinfo.lo_offset = offset; /* Associate free loop device with file. */ - if(!ioctl(dfd, LOOP_SET_FD, ffd) && - !ioctl(dfd, BB_LOOP_SET_STATUS, &loopinfo)) rc=0; - else ioctl(dfd, LOOP_CLR_FD, 0); + if(!ioctl(dfd, LOOP_SET_FD, ffd)) { + if (!ioctl(dfd, BB_LOOP_SET_STATUS, &loopinfo)) rc=0; + else ioctl(dfd, LOOP_CLR_FD, 0); + } /* If this block device already set up right, re-use it. (Yes this is racy, but associating two loop devices with the same |