tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
debugfs_cleanup
head: a04bbe0a2c7e98669e11a47f94e53dd8228bbeba
commit: e95d5bed5d58c2f5352969369827e7135fa2261e [4/5] fs: make d_path-like
functions all have unsigned size
config: i386-randconfig-m031-20211228
(https://download.01.org/0day-ci/archive/20220101/202201010156.bjvo7gaw-...@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <l...@intel.com>
smatch warnings:
fs/d_path.c:59 prepend() warn: unsigned 'p->len' is never less than zero.
vim +59 fs/d_path.c
b0cfcdd9b9672e Linus Torvalds 2021-07-16 55
b0cfcdd9b9672e Linus Torvalds 2021-07-16 56 static bool prepend(struct
prepend_buffer *p, const char *str, int namelen)
b0cfcdd9b9672e Linus Torvalds 2021-07-16 57 {
b0cfcdd9b9672e Linus Torvalds 2021-07-16 58 // Already overflowed?
b0cfcdd9b9672e Linus Torvalds 2021-07-16 @59 if (p->len < 0)
b0cfcdd9b9672e Linus Torvalds 2021-07-16 60 return false;
b0cfcdd9b9672e Linus Torvalds 2021-07-16 61
b0cfcdd9b9672e Linus Torvalds 2021-07-16 62 // Will overflow?
b0cfcdd9b9672e Linus Torvalds 2021-07-16 63 if (p->len < namelen) {
b0cfcdd9b9672e Linus Torvalds 2021-07-16 64 // Fill as much as
possible from the end of the name
b0cfcdd9b9672e Linus Torvalds 2021-07-16 65 str += namelen - p->len;
b0cfcdd9b9672e Linus Torvalds 2021-07-16 66 p->buf -= p->len;
b0cfcdd9b9672e Linus Torvalds 2021-07-16 67 prepend_copy(p->buf,
str, p->len);
b0cfcdd9b9672e Linus Torvalds 2021-07-16 68 p->len = -1;
b0cfcdd9b9672e Linus Torvalds 2021-07-16 69 return false;
b0cfcdd9b9672e Linus Torvalds 2021-07-16 70 }
b0cfcdd9b9672e Linus Torvalds 2021-07-16 71
b0cfcdd9b9672e Linus Torvalds 2021-07-16 72 // Fits fully
ad08ae586586ea Al Viro 2021-05-12 73 p->len -= namelen;
ad08ae586586ea Al Viro 2021-05-12 74 p->buf -= namelen;
b0cfcdd9b9672e Linus Torvalds 2021-07-16 75 return prepend_copy(p->buf,
str, namelen);
7a5cf791a74764 Al Viro 2018-03-05 76 }
7a5cf791a74764 Al Viro 2018-03-05 77
:::::: The code at line 59 was first introduced by commit
:::::: b0cfcdd9b9672ea90642f33d6c0dd8516553adf2 d_path: make 'prepend()' fill
up the buffer exactly on overflow
:::::: TO: Linus Torvalds <torva...@linux-foundation.org>
:::::: CC: Linus Torvalds <torva...@linux-foundation.org>
---
0-DAY CI Kernel Test Service, Intel Corporation
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