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| author | Vasily Gorbik <gor@linux.ibm.com> | 2018-06-17 00:30:43 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-07-02 11:24:50 +0200 |
| commit | 6b2ddf33baec23dace85bd647e3fc4ac070963e8 (patch) | |
| tree | d2ca4ccd93e428556bcafbc4b673ad2f7237f906 /arch | |
| parent | d642d6262f4fcfa5d200ec6e218c17f0c15b3390 (diff) | |
| download | linux-stable-6b2ddf33baec23dace85bd647e3fc4ac070963e8.tar.gz linux-stable-6b2ddf33baec23dace85bd647e3fc4ac070963e8.tar.bz2 linux-stable-6b2ddf33baec23dace85bd647e3fc4ac070963e8.zip | |
s390/extmem: fix gcc 8 stringop-overflow warning
arch/s390/mm/extmem.c: In function '__segment_load':
arch/s390/mm/extmem.c:436:2: warning: 'strncat' specified bound 7 equals
source length [-Wstringop-overflow=]
strncat(seg->res_name, " (DCSS)", 7);
What gcc complains about here is the misuse of strncat function, which
in this case does not limit a number of bytes taken from "src", so it is
in the end the same as strcat(seg->res_name, " (DCSS)");
Keeping in mind that a res_name is 15 bytes, strncat in this case
would overflow the buffer and write 0 into alignment byte between the
fields in the struct. To avoid that increasing res_name size to 16,
and reusing strlcat.
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/mm/extmem.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/mm/extmem.c b/arch/s390/mm/extmem.c index 6ad15d3fab81..84111a43ea29 100644 --- a/arch/s390/mm/extmem.c +++ b/arch/s390/mm/extmem.c @@ -80,7 +80,7 @@ struct qin64 { struct dcss_segment { struct list_head list; char dcss_name[8]; - char res_name[15]; + char res_name[16]; unsigned long start_addr; unsigned long end; atomic_t ref_count; @@ -433,7 +433,7 @@ __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long memcpy(&seg->res_name, seg->dcss_name, 8); EBCASC(seg->res_name, 8); seg->res_name[8] = '\0'; - strncat(seg->res_name, " (DCSS)", 7); + strlcat(seg->res_name, " (DCSS)", sizeof(seg->res_name)); seg->res->name = seg->res_name; rc = seg->vm_segtype; if (rc == SEG_TYPE_SC || |