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nfs: fix undefined behavior in nfs_block_bits()

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BugLink: https://bugs.launchpad.net/bugs/2073788

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>
Signed-off-by: Portia Stephens <portia.stephens@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Sergey Shtylyov
2024-05-10 23:24:04 +03:00
committed by Roxana Nicolescu
parent 66663ae9b8
commit 9e9996ede6
1 changed files with 2 additions and 2 deletions
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fs/nfs/internal.h
+2 -2
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@@ -712,9 +712,9 @@ 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;
}