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lib: Ensure pointer exists before using in mlag

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Ensure that the s pointer is valid and usable before
grabbing data off of it.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2020-03-18 07:15:05 -04:00
parent 7791cff31f
commit d1ba1814bc
1 changed files with 4 additions and 1 deletions
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5
lib/mlag.c
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@ -85,9 +85,12 @@ int mlag_lib_decode_mlag_hdr(struct stream *s, struct mlag_msg *msg,
size_t *length) size_t *length)
{ {
#define LIB_MLAG_HDR_LENGTH 8 #define LIB_MLAG_HDR_LENGTH 8
if (s == NULL || msg == NULL)
return -1;
*length = stream_get_endp(s); *length = stream_get_endp(s);
if (s == NULL || msg == NULL || *length < LIB_MLAG_HDR_LENGTH) if (*length < LIB_MLAG_HDR_LENGTH)
return -1; return -1;
*length -= LIB_MLAG_HDR_LENGTH; *length -= LIB_MLAG_HDR_LENGTH;