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| author | Masahiro Yamada <masahiroy@kernel.org> | 2020-06-01 08:57:19 +0300 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2020-06-06 17:38:13 +0300 |
| commit | 7c8f5662c502b7b967399fef8a64532ec43b063d (patch) | |
| tree | e43532144df75586abca8681546cc43d6f09ffe8 /scripts/mod | |
| parent | f531c1b5de65bc687bdcca69e7649fe2db5b6d87 (diff) | |
| download | linux-7c8f5662c502b7b967399fef8a64532ec43b063d.tar.xz | |
modpost: avoid false-positive file open error
One problem of grab_file() is that it cannot distinguish the following
two cases:
- It cannot read the file (the file does not exist, or read permission
is not set)
- It can read the file, but the file size is zero
This is because grab_file() calls mmap(), which requires the mapped
length is greater than 0. Hence, grab_file() fails for both cases.
If an empty header file were included for checksum calculation, the
following warning would be printed:
WARNING: modpost: could not open ...: Invalid argument
An empty file is a valid source file, so it should not fail.
Use read_text_file() instead. It can read a zero-length file.
Then, parse_file() will succeed with doing nothing.
Going forward, the first case (it cannot read the file) is a fatal
error. If the source file from which an object was compiled is missing,
something went wrong.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'scripts/mod')
| -rw-r--r-- | scripts/mod/sumversion.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/scripts/mod/sumversion.c b/scripts/mod/sumversion.c index 5fb142db6195..9f77c9dfce20 100644 --- a/scripts/mod/sumversion.c +++ b/scripts/mod/sumversion.c @@ -258,9 +258,8 @@ static int parse_file(const char *fname, struct md4_ctx *md) char *file; unsigned long i, len; - file = grab_file(fname, &len); - if (!file) - return 0; + file = read_text_file(fname); + len = strlen(file); for (i = 0; i < len; i++) { /* Collapse and ignore \ and CR. */ @@ -287,7 +286,7 @@ static int parse_file(const char *fname, struct md4_ctx *md) add_char(file[i], md); } - release_file(file, len); + free(file); return 1; } /* Check whether the file is a static library or not */ |