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| author | Sergey Shtylyov <s.shtylyov@omp.ru> | 2024-05-10 23:24:04 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-06-16 14:47:47 +0300 |
| commit | d6ea0e12befb21a23e0a9471e6ede6fb0c11c708 (patch) | |
| tree | 36f0b5b72e6139f288feb4298e310a1e0ccea24b | |
| parent | 9191b574d7dc646028fd596300fbe5b68b997c0f (diff) | |
| download | linux-d6ea0e12befb21a23e0a9471e6ede6fb0c11c708.tar.xz | |
nfs: fix undefined behavior in nfs_block_bits()
commit 3c0a2e0b0ae661457c8505fecc7be5501aa7a715 upstream.
Shifting *signed int* typed constant 1 left by 31 bits causes undefined
behavior. Specify the correct *unsigned long* type by using 1UL instead.
Found by Linux Verification Center (linuxtesting.org) with the Svace static
analysis tool.
Cc: stable@vger.kernel.org
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/nfs/internal.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index c91bce41931f..8bceaac2205c 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -710,9 +710,9 @@ unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) if ((bsize & (bsize - 1)) || nrbitsp) { unsigned char nrbits; - for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) + for (nrbits = 31; nrbits && !(bsize & (1UL << nrbits)); nrbits--) ; - bsize = 1 << nrbits; + bsize = 1UL << nrbits; if (nrbitsp) *nrbitsp = nrbits; } |