* [android-common:android17-6.18 32/32] fs/fuse/file.c:959 fuse_readpages_end() warn: variable dereferenced before check 'mapping' (see line 944)
@ 2026-08-18 16:58 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-08-18 16:58 UTC (permalink / raw)
To: oe-kbuild; +Cc: lkp, Dan Carpenter
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: cros-kernel-buildreports@googlegroups.com
tree: https://android.googlesource.com/kernel/common android17-6.18
head: 5c36f73a41f1533cae407eba882ca2940e1775f1
commit: be926e6761d28d105ba672242e81e911e0d7e5e0 [32/32] ANDROID: fuse-bpf: fuse-bpf v1.3
:::::: branch date: 29 hours ago
:::::: commit date: 5 months ago
config: x86_64-randconfig-161 (https://download.01.org/0day-ci/archive/20260819/202608190010.lNezCZVt-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
smatch: v0.5.0-9187-g5189e3fb
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202608190010.lNezCZVt-lkp@intel.com/
smatch warnings:
fs/fuse/file.c:959 fuse_readpages_end() warn: variable dereferenced before check 'mapping' (see line 944)
vim +/mapping +959 fs/fuse/file.c
a4c9ab1d4975746 Joanne Koong 2025-07-15 930
fcee216beb9c15c Max Reitz 2020-05-06 931 static void fuse_readpages_end(struct fuse_mount *fm, struct fuse_args *args,
134831e36bbdd6c Miklos Szeredi 2019-09-10 932 int err)
db50b96c0f28a21 Miklos Szeredi 2005-09-09 933 {
c1aa96a52e9594f Miklos Szeredi 2006-01-16 934 int i;
134831e36bbdd6c Miklos Szeredi 2019-09-10 935 struct fuse_io_args *ia = container_of(args, typeof(*ia), ap.args);
134831e36bbdd6c Miklos Szeredi 2019-09-10 936 struct fuse_args_pages *ap = &ia->ap;
134831e36bbdd6c Miklos Szeredi 2019-09-10 937 size_t count = ia->read.in.size;
134831e36bbdd6c Miklos Szeredi 2019-09-10 938 size_t num_read = args->out_args[0].size;
02d47e213dce6e2 Joanne Koong 2025-08-29 939 struct address_space *mapping;
02d47e213dce6e2 Joanne Koong 2025-08-29 940 struct inode *inode;
ce534fb052928ce Miklos Szeredi 2010-05-25 941
02d47e213dce6e2 Joanne Koong 2025-08-29 942 WARN_ON_ONCE(!ap->num_folios);
02d47e213dce6e2 Joanne Koong 2025-08-29 943 mapping = ap->folios[0]->mapping;
02d47e213dce6e2 Joanne Koong 2025-08-29 @944 inode = mapping->host;
c1aa96a52e9594f Miklos Szeredi 2006-01-16 945
5c5c5e51b26413d Miklos Szeredi 2008-04-30 946 /*
5c5c5e51b26413d Miklos Szeredi 2008-04-30 947 * Short read means EOF. If file size is larger, truncate it
5c5c5e51b26413d Miklos Szeredi 2008-04-30 948 */
134831e36bbdd6c Miklos Szeredi 2019-09-10 949 if (!err && num_read < count)
134831e36bbdd6c Miklos Szeredi 2019-09-10 950 fuse_short_read(inode, ia->read.attr_ver, num_read, ap);
5c5c5e51b26413d Miklos Szeredi 2008-04-30 951
451418fc928b5ec Andrew Gallagher 2013-11-05 952 fuse_invalidate_atime(inode);
c1aa96a52e9594f Miklos Szeredi 2006-01-16 953
0c67c37e1710b2a Joanne Koong 2025-02-11 954 for (i = 0; i < ap->num_folios; i++) {
51b025301824f16 Joanne Koong 2024-10-24 955 folio_end_read(ap->folios[i], !err);
0c67c37e1710b2a Joanne Koong 2025-02-11 956 folio_put(ap->folios[i]);
0c67c37e1710b2a Joanne Koong 2025-02-11 957 }
134831e36bbdd6c Miklos Szeredi 2019-09-10 958 if (ia->ff)
be926e6761d28d1 Paul Lawrence 2021-12-02 @959 fuse_file_put(mapping ? mapping->host : NULL, ia->ff, false);
134831e36bbdd6c Miklos Szeredi 2019-09-10 960
134831e36bbdd6c Miklos Szeredi 2019-09-10 961 fuse_io_free(ia);
c1aa96a52e9594f Miklos Szeredi 2006-01-16 962 }
c1aa96a52e9594f Miklos Szeredi 2006-01-16 963
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
* [android-common:android17-6.18 32/32] fs/fuse/file.c:959 fuse_readpages_end() warn: variable dereferenced before check 'mapping' (see line 944)
@ 2026-08-19 7:51 Dan Carpenter
0 siblings, 0 replies; 2+ messages in thread
From: Dan Carpenter @ 2026-08-19 7:51 UTC (permalink / raw)
To: oe-kbuild, cros-kernel-buildreports; +Cc: lkp, oe-kbuild-all
tree: https://android.googlesource.com/kernel/common android17-6.18
head: 5c36f73a41f1533cae407eba882ca2940e1775f1
commit: be926e6761d28d105ba672242e81e911e0d7e5e0 [32/32] ANDROID: fuse-bpf: fuse-bpf v1.3
config: x86_64-randconfig-161 (https://download.01.org/0day-ci/archive/20260819/202608190010.lNezCZVt-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
smatch: v0.5.0-9187-g5189e3fb
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202608190010.lNezCZVt-lkp@intel.com/
smatch warnings:
fs/fuse/file.c:959 fuse_readpages_end() warn: variable dereferenced before check 'mapping' (see line 944)
vim +/mapping +959 fs/fuse/file.c
fcee216beb9c15c Max Reitz 2020-05-06 931 static void fuse_readpages_end(struct fuse_mount *fm, struct fuse_args *args,
134831e36bbdd6c Miklos Szeredi 2019-09-10 932 int err)
db50b96c0f28a21 Miklos Szeredi 2005-09-09 933 {
c1aa96a52e9594f Miklos Szeredi 2006-01-16 934 int i;
134831e36bbdd6c Miklos Szeredi 2019-09-10 935 struct fuse_io_args *ia = container_of(args, typeof(*ia), ap.args);
134831e36bbdd6c Miklos Szeredi 2019-09-10 936 struct fuse_args_pages *ap = &ia->ap;
134831e36bbdd6c Miklos Szeredi 2019-09-10 937 size_t count = ia->read.in.size;
134831e36bbdd6c Miklos Szeredi 2019-09-10 938 size_t num_read = args->out_args[0].size;
02d47e213dce6e2 Joanne Koong 2025-08-29 939 struct address_space *mapping;
02d47e213dce6e2 Joanne Koong 2025-08-29 940 struct inode *inode;
ce534fb052928ce Miklos Szeredi 2010-05-25 941
02d47e213dce6e2 Joanne Koong 2025-08-29 942 WARN_ON_ONCE(!ap->num_folios);
02d47e213dce6e2 Joanne Koong 2025-08-29 943 mapping = ap->folios[0]->mapping;
02d47e213dce6e2 Joanne Koong 2025-08-29 @944 inode = mapping->host;
^^^^^^^^^^^^^
Dereferenced
c1aa96a52e9594f Miklos Szeredi 2006-01-16 945
5c5c5e51b26413d Miklos Szeredi 2008-04-30 946 /*
5c5c5e51b26413d Miklos Szeredi 2008-04-30 947 * Short read means EOF. If file size is larger, truncate it
5c5c5e51b26413d Miklos Szeredi 2008-04-30 948 */
134831e36bbdd6c Miklos Szeredi 2019-09-10 949 if (!err && num_read < count)
134831e36bbdd6c Miklos Szeredi 2019-09-10 950 fuse_short_read(inode, ia->read.attr_ver, num_read, ap);
5c5c5e51b26413d Miklos Szeredi 2008-04-30 951
451418fc928b5ec Andrew Gallagher 2013-11-05 952 fuse_invalidate_atime(inode);
c1aa96a52e9594f Miklos Szeredi 2006-01-16 953
0c67c37e1710b2a Joanne Koong 2025-02-11 954 for (i = 0; i < ap->num_folios; i++) {
51b025301824f16 Joanne Koong 2024-10-24 955 folio_end_read(ap->folios[i], !err);
0c67c37e1710b2a Joanne Koong 2025-02-11 956 folio_put(ap->folios[i]);
0c67c37e1710b2a Joanne Koong 2025-02-11 957 }
134831e36bbdd6c Miklos Szeredi 2019-09-10 958 if (ia->ff)
be926e6761d28d1 Paul Lawrence 2021-12-02 @959 fuse_file_put(mapping ? mapping->host : NULL, ia->ff, false);
^^^^^^^
Checked too late.
134831e36bbdd6c Miklos Szeredi 2019-09-10 960
134831e36bbdd6c Miklos Szeredi 2019-09-10 961 fuse_io_free(ia);
c1aa96a52e9594f Miklos Szeredi 2006-01-16 962 }
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-08-19 7:51 [android-common:android17-6.18 32/32] fs/fuse/file.c:959 fuse_readpages_end() warn: variable dereferenced before check 'mapping' (see line 944) Dan Carpenter
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2026-08-18 16:58 kernel test robot
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